I think they should be able to handle most of those issues, for example they may be able to use wave power for power generation. Furthermore, I don't see how RF opacity is an issue, seeing as anyone running a data center over RF is criminally insane.
You run management connections from separate computers over RF as a backup and for fail-over in event everything else fails. I mentioned that in a recent comment related to Github outage and preventing those:
Can help with certain security situations, too. Not sure how much that applies if it's underwater, though. Most infiltrations would probably turn into a denial-of-service attack effectively haha.
I tried to get it further by proposing a neutrino-based communication system. Can just send the signals straight through the planet itself to a datacenter very far away. I was told there would be both implementation problems and cost overruns with that project. Went back to default recommendations for wireless.
edit: I can't grammar